Precisely. And the Japan Maritime Self Defense Force maintains a distinct and healthy qualitative and quantitative milieu in regards to key strategic vessels that would ensure maritime domination in the event of a conflict scenario.
The JMSDF's ASW force negates any sub threat around our Maritime domain. This allows the entire Surface Fleet to address and focus on hostile surface vessels. Which i have already addressed in my prior posts, and thus i must emphasize the issue of fleet screen and massing ships of the line. The geographic proximity of JMSDF's 4 escort fleets allows a much rapid and cohesive negotiation , whereas the enemy must take time to form and combine their fleets, which will, be engaged upon by the Kaijo Jeitai Rengo Kantai. The massing of the enemy's fleet assets will be limited as well because it will not leave its southern corridor unguarded. In the event of assymetric strategies that will unfold in that geographic proximity.
I believe that you do not fully comprehend the capability and deployment of Japan's Anti Ballistic Missile Strategem. As well, you have not taken into consideration the presence of the United States' 7th Fleet, and its associated 2-3 Carrier Battle Groups that patrols adjacent areas. The deployment of Cruisers and notable destroyers of the 7th Fleet collaborate with key vessels of the Kaijo Jeita Rengo Kantai on fleet screen duties, ASW duties, Anti-Ballistic Capability, as well as on strike capabilities.
The United States' Foreign Policy in Asia-Pacific is centered on Japan -- the greatest ally in the Asia-Pacific Region. In the event of initiation of hostilities, the mutual defense pact will be mobilized, and the combined force of the JMSDF and the USN would , for lack of a better word, not only gut the enemy's surface fleet, but would prevent the enemy's merchant fleet and assymetric sub force from negotiating into a position that would threaten logistical, command and support resources.